Process for producing water-absorbent resin

摘要

A water-absorbent resin having high absorption capacity and a slight amount of water-soluble ingredients is produced by a process, which includes polymerizing a water-soluble monoethylenic unsaturated monomer in the presence of a crosslinking agent, and using a bifunctional compound represented by the following general formula +E,crc/1/ as the crosslinking agent; (* CHEMICAL STRUCTURE *) 1 (circle) wherein R1 and R2 are a hydrogen atom or a methyl group independently, and -(X)- is a divalent organic group combined in a straight chain type by an optional arrangement of a structural unit (A) of -(CO-CH=CH-CO-O)L- and l=1-5, a structural unit (B) of -(CH2CH2O)m- and m=2-100, and a structural unit (C) of -(R3O)n- and n=0-20, in which R3 is a C3-C4 alkylene.